printf + fflush

• Already have the code for this:

• error_msg_warning()

• error_msg_fatal()

• Make a trace of each process is trivial

void sample_routine(…)

{

#ifdef DEBUG

error_msg_warning(“start sample_routine\n”);

#endif

…

#ifdef DEBUG

error_msg_warning(“end sample_routine\n”);

#endif

}

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